Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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You can copy data from docker volumes to somewhere on the host node to do the backup from there. You can also have a container using the volumes and from there you can send directly to remote, or map a dorectory on the host node to copy the files to.
If you are running a database or something stateful, look at best practices for backup and then adjust to it.
Or not use volumes and map onto the host node directly. each works, and had its own advantages/disadvantages.